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How does the graph of \(y=2|x|\) change compared with the graph of \(y=|x|\)?

Answer and explanation

Correct answer: Vertical stretch by a factor of 2

In \(y=2|x|\), the output of the parent function \(|x|\) is multiplied by 2. Thus every \(y\)-value doubles while the \(x\)-values remain unchanged, producing a vertical stretch; the vertex stays at the origin. A horizontal stretch would involve changing the input, as in \(y=|2x|\). Exam tip: a multiplier outside the function causes a vertical transformation, whereas one inside the function affects the horizontal scale.

Related tags

GraphsTransformationsAbsolute ValueStandard FunctionsGraphs Of Standard FunctionsRelations And FunctionsMathematicsClass 11 Mcq

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